Function rin::gl::image_based_light::equirectangular_to_cubemap_allocate_levels

pub fn equirectangular_to_cubemap_allocate_levels(
    map: &Texture, 
    size: u32, 
    color_format: ColorFormat, 
    gl: &Renderer<'_, Screen>
) -> CubeMap

Convert a texture containing an equirectangular environment map into a cubemap

The resulting cubemap will have memory allocated for all the possible mip levels